20-20-20 Eye Strain Break Timer

The 20-20-20 rule is the standard optometric advice for screen strain; this just counts how many breaks your session owes you. Free, instant

Quick answer: The 20-20-20 rule is the standard optometric advice for screen strain; this just counts how many breaks your session owes you. Free, instant, private — runs entirely in your browser.

Session length (min)

How to use

Fill the fields above — results update as you type.
Adjust any input to compare scenarios instantly.
Nothing is uploaded; everything runs in your browser.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

The 20-20-20 rule is the standard optometric advice for screen strain; this just counts how many breaks your session owes you.

FAQ

20-20-20 Eye Strain Break Timer — is it really free?

Yes. No signup, no watermark, no hidden limit — the logic runs entirely in your browser and nothing is uploaded.

Does 20-20-20 Eye Strain Break Timer store my inputs?

No. Everything is computed on your device; closing the tab erases it all.

Rate this tool

Your rating stays in this browser (local storage) — nothing is sent to any server.

Related tools

🔥

The complete eye strain break timer guide

Prefer the long version — a worked example, the mistakes people actually make, and answers to real questions? The blog guide Eye Strain Break Timer — Complete Guide, Mistakes & FAQ covers all of it step by step.

Browse the collection: Health & Fitness — All 41 Free Online Tools

20-20-20 Eye Strain Break Timer

How to use

About this tool

FAQ

Rate this tool

Related tools

TDEE & Calorie Calculator

Pregnancy Due Date Calculator

Ovulation Calculator

Body Fat Calculator

Macro Calculator

Ideal Weight Calculator

Water Intake Calculator

Heart Rate Zone Calculator

One Rep Max Calculator

Blood Pressure Checker

Sleep Cycle Calculator

Running Pace Calculator

Heart Rate Zone Calculator

Calories Burned Calculator

Child Height Predictor

Screen Time Planner for Kids

Habit Streak Tracker

Steps to Calories Calculator

Standard Drink / Units Calculator

Life in Weeks Visualizer

Protein Intake Calculator

Intermittent Fasting Window Planner

VO₂ Max Estimator (from pace & heart rate)

Recovery Heart Rate Calculator

Menstrual Cycle Predictor (Local-Only)

Medication Schedule Builder (Reminder Times Only)

Skin Type Quiz + Routine Order

A1C to Average Glucose Calculator

Blood Pressure Category Calculator

Online Hearing Test (Pure Tones)

Baby Weight Percentile (WHO)

Caffeine Half-Life Calculator

Pregnancy Weight Gain Calculator

Private Period Tracker

Blood Type Compatibility Chart

Smoking Cost Calculator

Steps to KM Converter

Ishihara-Style Color Blindness Test

GFR Calculator (CKD-EPI 2021)

Ideal Body Weight Calculator

BSA Calculator

The complete eye strain break timer guide